ref: ccfd02dd2dcfa72085c4dc4f29dea58313964b57
dir: /src/gfxdata/icon/LICENSE.txt/
Someone made this icon for me for free, and I don't really know what license it has... This icon is only used for the macOS/Windows/Linux release binary, so you can simply remove it if it causes issue with licensing. Other than that, I'm fairly sure the creator would be permissive about its use, so as long as it's not used under commercial circumstances, it should be fine.